H2O Vulnerable to Denial of Service (DoS) via Large GZIP Parsing
In h2oai/h2o-3 version 3.46.0.2, a vulnerability exists where uploading and repeatedly parsing a large GZIP file can cause a denial of service. The server becomes unresponsive due to memory exhaustion and a large number of concurrent slow-running jobs. This issue arises from the improper handling of highly compressed data, leading to significant data amplification.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | ai.h2o:h2o-core | >= 3.32.1.2, <= 3.46.0.2 | no fix |
| Python (PyPI) | h2o | >= 3.32.1.2, <= 3.46.0.2 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2024-7765
- https://github.com/h2oai/h2o-3
- https://github.com/h2oai/h2o-3/blob/7d418fa19d3ab434f742818e37f891bef9102c97/h2o-core/src/main/java/water/parser/ParseDataset.java#L900
- https://huntr.com/bounties/0e58b1a5-bdca-4e60-af92-09de9c76a9ff
- https://pypi.org/project/h2o
- https://github.com/advisories/GHSA-6w62-3jvj-mfj6
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-409- Platform
- Java / Kotlin (Maven), Python (PyPI)
- Package
ai.h2o:h2o-core, h2o- Disclosed
- 20.03.2025
- Updated
- 11.10.2026 13:18
Sources and licenses
OSV / GitHub Advisory Database - GHSA-6w62-3jvj-mfj6 - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-1439 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: ai.h2o:h2o-core
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 15
- First → latest
- 11.2023 04.2026
- Without a fix
- 13
- Exploited in attacks
- 0
Severity breakdown
- Critical 6
- High 8
- Medium 1
Disclosures per year
- 2023: 1
- 2024: 2
- 2025: 10
- 2026: 2
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H2O Vulnerable to Denial of Service (DoS) via Large GZIP Parsing this entry
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